/*
 * Tencent is pleased to support the open source community by making BK-CI 蓝鲸持续集成平台 available.
 *
 * Copyright (C) 2020 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * BK-CI 蓝鲸持续集成平台 is licensed under the MIT license.
 *
 * A copy of the MIT License is included in this file.
 *
 *
 * Terms of the MIT License:
 * ---------------------------------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.tencent.bkrepo.npm.utils

object MigrationUtils {
    /**
     * 数据分割
     */
    fun <T> split(set: Set<T>, count: Int = 1000): List<List<T>> {
        val list = set.toList()
        if (set.isEmpty()) {
            return emptyList()
        }
        val resultList = mutableListOf<List<T>>()
        var itemList: MutableList<T>?
        val size = set.size

        if (size < count) {
            resultList.add(list)
        } else {
            val pre = size / count
            val last = size % count
            for (i in 0 until pre) {
                itemList = mutableListOf()
                for (j in 0 until count) {
                    itemList.add(list[i * count + j])
                }
                resultList.add(itemList)
            }
            if (last > 0) {
                itemList = mutableListOf()
                for (i in 0 until last) {
                    itemList.add(list[pre * count + i])
                }
                resultList.add(itemList)
            }
        }
        return resultList
    }
}
